HDMI black screen after 6.16.12

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From	code@luigifab.fr
Newsgroups	linux.debian.kernel
Subject	HDMI black screen after 6.16.12
Date	Wed, 13 May 2026 22:50:02 +0200
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Hello,

I am reporting a regression in the amdgpu driver affecting HDMI output 
on a second display with "AMD A12-9800E RADEON R7 (4C+8G)" on all Debian 
testing kernels newer than 6.16.12+deb14+1-amd64.

CPU/GPU : AMD A12-9800E RADEON R7
Distribution : Debian testing (forky)
Display server : X11
Last working kernel : 6.16.12+deb14+1-amd64
First broken kernel : all official Debian testing kernels above 6.16.12, 
including 7.0

Since upgrading, the second display connected via HDMI is no longer 
activated when X starts (black screen with no signal). The primary 
display works normally. Rebooting on kernel 6.16.12 immediately restores 
normal dual-monitor operation.

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HDMI black screen after 6.16.12 code@luigifab.fr - 2026-05-13 22:50 +0200

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